Center finder and punch



J. SHAYLOR.

CENTERVFINDER AND PUNCH. [APPLICATION FILED Aus .2s. '1917.

1 ,3781287 Patented May 17, 1921.

6 Z /9 id 3 conical member forlengaging the work and .35

f T 0 aZZ whom it Mayconcem um Ees er P -r me tlifi Jorrn siinY-Lom' ortrnnnnwom), new JERsEv.

Be-it known that I, Jon SHAYLOR, a citizen of the UnitedStates,'residing at Lin denwold, in the county of Camden and State ofNew Jersey, have invented certain new and useful Improvements in CenterFinders .and Punches; and'l do hereby de-'- clare the following to be afull, clear, and

exact description of the invention, such as will enablewothers skilledin the artto which itappertains to make and use the.

same.

This invention relates to a center finder andpunch, and the primaryobject of the invention is to provide a punch especially adapted forfinding. ters of shafts.

Another object of the invention is the provision of means forautomatically bringing the punch directly in the center of the andmarking. the censhaft, so that the punch can be actuated soas toaccurately mark the center of the shaft in a comparatively short time.

A further object of the invention is the provision of a hollowfrusto-conical member carrying a sliding'punch on its upper end,

the frusto-conical member forming a guide for the work, so that thepunch will automatically be positioned in the-exact center of the work.l i

A still further object of the invention is the provision of; anadjustable guide caried by the lower portion of the frustoholding thesame in position in the frustoconical member, while the sliding punchisbeing actuated. V

A still further object of the invention is the provision of means formoving the slid ing punch downward into engagement w1ththe work afterthe center has been found,

so that the same can be forcibly brought into engagement with the workto mark the center on the shaft.

A still further object of the invention is the provision of a centerfinder and punch of the above character, which is durable and efficientin use, one that is simple and easy to manufacture and one that can beplaced upon-the market at a reasonable price. 7

-With these and'other ob ects 1n v1ew the invention consists in thenovel construc-- tion, arrangement and formation of parts,

as will be hereinafter more specifically described, claimed andillustrated in the aconn'rnn rrivnnn nlvn'rnncrr.

I specification of Lettersiatent. t nt M fy 17;" Application fil edAugust 29, 1917. Serial 110.188,?86. 1

companying drawings, thereof, in which a through the improved centerfinder and punch, and i forming a part 1 Figure 1' is a vertical sectiontaken Fig. 2 is a section taken on the line 2--2 I of F ' Referring towhereln slmllar reference numerals desig nate corresponding partsthroughout the cates the improved center finder and punch, whichincludes a hollow frusto-conical member'2 having a' tubular housing 3formed'on its upper surface asat 1.

the drawings in, detail,

several views,'the numeral- '1 generallyindi-..

punch 5 is slidably mounted in the tubular I housingand consistsof acylindrical shank threaded as at 10 and receives an internally threadedcap 11, which closes the upper end of the tubular housing. The cap 11 isprovided-with a central opening 12 through which the upper end of theshank of thepunch protrudes and the cap forms a guide for the punch 5. ir p An outwardly extending ear 13 is formed on the lower edge of the.frusto-conica-l member. 2 and supports a guide 14:. The guide 14'includesa horizontally extending arm 15 and adownwardly extending rightangularly positioned arm 16 .which is adaptedto bear against the workafterthe same has been placed in the frusto conicalmember 2. v v I Adiagonal brace arm 17 extends from one arm tothe other and forms a rigidstructure.

The horizontal arm 15 isprovided 'witha slot 18 through which extendsthe set screw 19. The set screw 19 extends through an aperture in theear 13 and a winged nut 20 is fitted on the-end of the set screw and byloosening or tightening the setscrew 19 the guide 14 can be movedinwardly or outwardly.

The tubular housing?) is providedwith a vertical guideslot 21 throughwhich ex- I ,tends the actuating pin 22. The pin 22 is i guide l4 isthen moved into engagement threaded into the shank of the punch 5 and bymoving the same, the punch can, be brought downward into engagement withthe work against the tension of the spring 8. y In operation of theimproved center finder: and punch, the work which may be either a squareor round shaft is positioned in the frusto-conical'member which willguide the same upward and position the punch 5 directly overvthe centerof the shaft. The

with the work and the winged nut is tightened to hold the guide arm inengagement with the work and the pin 22 is then moved downwardly so asto position the punch in engagement with the work and then the punch isstruck with a hammer or the like so as to mark the center on the shaft,

Inpractice, I have found that the form of my invention, illustrated inthe accom-4' pany ng drawings and referred to in the above description,as the preferred embodiment, is the most eficient and practical; yet

realizing the conditions concurrent. with the adoption of my device willnecessarily vary,

I desire to emphasize the fact that various minor changes in details ofconstruction,

" proportion'and arrangement of parts may annular flange, a tubularhousing slidably receiving the punch and having an inner annular flangeengaglng'the punch, and

provided at its lower end-with a flared guide member, a cap groovedin-itslower side to receive the upper end of the housing and centrallyapertured to receive the punch,

and an expansion spring encompassing thepunch and confined between theannular flanges of the housing and punch.

I In testimony whereof I aflix my signature in presence of twowitnesses. V I

' JOHN SHAYLOR Witnessesr CHARLES SHAYLOR, EDWARD F. IRWIN.

